When home renewable reaches a level of penetration where simultaneous loss would be in excess of spinning reserve any further embedded generation will be regulated in such a way as to not contribute to the problem. For instance by prohibiting exporting energy back to the system, and separating your house from the system if the frequency is falling quickly and your embedded generation is going to trip,in order to avoid the simultaneous load step due to the loss of all the embedded generation they could just disconnect it all. And in that case the embedded generation can continue to feed your house if it can operate an isolated network.